RA-1, is the minimum standard size permitted, and may generally be used where the posted speed is 60 km/h or less. RA-101 should be used where the posted speed is 70 km/h or greater. The special oversize STOP sign (Ra-1101) may be used in locations where two relatively major roads (e.g., King's Highway, Regional or County Roads) intersect, particularly in high speed rural locations.